As information technology (IT) develops further, it is important to distinguish how it differs from operations technology (OT). Both types of technology can be used to improve a smart building. IT is the spectrum of technologies for processing information. IT usually includes the setup and maintenance of a network. OT is hardware and software that senses or causes a change in the monitoring or control of physical devices, processes and events. OT for a smart building typically includes HVAC, lighting and security. OT also ensures that the air quality in a building is good and the building does not have high CO2 emissions. Traditionally, OT is not networked. A connected, “aware” building that has both IT and OT can be transformed into a sustainable, green building. It is possible to bridge OT and IT infrastructure.